HSK 7-9
溜
liū动
to slip away; to escape in stealth; to skate
小偷趁人不注意从后门溜走。
Xiǎotōu chènrén bú zhùyì cóng hòumén liūzǒu.
The thief slipped away through the back door while no one was looking.
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Appears across levels (7-9) in the HSK 3.0 word list.